Telephone head set



Nov. 4 1924. 1,513,924

W. J. MURDOCK TELEPHONE HEAD SET Filed May 12 1921 kg MW AL 0 Patented Nov. 4, 1924.

P, TENT OFFICE.

WILLIAIVL J. IKURDO'CK, {3F CHELSEA, vlt/lASSACTH .EaETClTS,.

TELEPHONE HEAD SET.

Application filed May 12, 1921.

To all whom it may concern.

Be it known that 1, WILLIAM J. ltfnnoocii, a citizen of the United States, residing at Chelsea, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Telephone Head Sets, of which the following is a specification.

This invention relates to telephone receivers of that type employing a pair of diaphragm elements which are supported on the head of the operator, one element being positioned at each ear. It relates more specifically to the construction of the headgear by which the receiving elements are carried and to novel mechanism by which these elements may be readily adjusted to conform to the individual requirements of each operator.

For a more complete understanding of the invention, together with other objects and advantageous details and combinations of parts, reference may be had to the accompanying drawings, in which- Figure 1 is a side elevation of the head set.

Figure 2 is a fragmentary plan of one end thereof.

Figure 3 is a partial end View.

Figure 4: is a detailed section on line 44 of Figure 2.

Referring to these drawings, a pair of diaphragm receiver elements is shown at 1, each element being pivotally supported at 2 within a yoke holding member 3w This member is composed of a strip bent to substantially U-form, and made fast thereto at t is a stem 5. Each stem is supported in a perforated block 6 through which the stem may slide, this block forming an anchorage in which are cast or embedded opposite ends of a pair of wires 7 converging toward theiropposite ends and spaced apart midway, these wires forming resilient elements tending to hold the diaphragm elements 1 into contact with the head of the wearer. The wires 7 are covered with fabric pads 9 to provide an extended and cushioned bearing against the head of the wearer.

In order to hold the stems 5 in adjusted position within the blocks 6, friction clamping elements comprising leaf springs as 10 are employed. The springs 10 are bent into Serial No. 468,808.

substantially U-form to partially enclose the blocks 6, the central portion thereof being of a width to pass freely between the ends of the wires 7, and the outer ends of the springs being widened and perforated to take over the stems 5 beyond either end of the blocks 6. The block 6 holds the corresponding spring in position by passing between the ends thereof, and the wires 7 retain it from any considerable rotary movement about the axis of the stem. The stems themselves, however, are allowed a turning movement about their axes, the springs 10 providing a small frictional resistance to such motion, so that the elements 1 are universally rockable. The outer ends of the stems 5 are provided with annular recesses 11 which serve as stop notches in which the outer arms of the springs 10 may engage as the ends of the stems near the blocks to retain the stems from accidental disengagement.

As shown in dotted lines in Figure 4:, the spring element 10 tends to approach a straight line position so that the edges of the perforations therein clamp against the stem 5 to prevent axial movement, while by pressing the ends toward each other this action ceases so that the stems may be adjusted as desired.

Having thus described one embodiment of this invention, it should be evident that va rious modifications and changes might be made therein without departing from its spirit or scope as defined by the appended claims.

1. A device of the class described comprising a pair of spaced spring arms converging at their ends, a pair of perforated blocks in which the adjacent ends of both arms are embedded, a receiver-holding ele ment having a stem slidably mounted in the perforation of each block, and a leaf spring passing between said arms and having its opposite ends perforated for taking over said stem at opposite ends of said block.

2. A device of the class described comprising a receiver-holding element having a stem, a block perforated to slidably receive said stem, a head band having its end embedded in said block, and a spring element partially enclosing said block and perforated to frictionally engage said stem beyond opposite faces of said block.

3. A device of the class described comprising a receiver-holding element having .a

stem, a block perforated to slidably receive said stem, a pair of converging spring arms havlng their achacent ends embedded in said block, and a spring element partially enclosing said block and perforated to frictionally engage said stem beyond opposite faces of said block, said element passing between said spring arms.

In testimony whereof I have afiixed my signature.

WILLIAM J. MURDOGK. 

